using System.Text;
using UnityEngine;

namespace Core.Net
{
    /// <summary>
    /// 包头携带长度
    /// </summary>
	public class LVProtocal : Protocal
    {
        private int status;
        private byte[] hllenbyte = new byte[4]; //包头长度数据
        private int h;
        private int l;
        private int len;
        private ByteBuf buf;

        public LVProtocal()
        {

        }
        /**
		 * 分帧逻辑
		 * 
		 **/
        public Frame TranslateFrame(ByteBuf src)
        {
            while (src.ReadableBytes() > 0)
            {
                switch (status)
                {
                    case 0:
                        hllenbyte[status] = src.ReadByte();
                        status = 1;
                        break;
                    case 1:
                        hllenbyte[status] = src.ReadByte();
                        status = 2;
                        break;
                    case 2:
                        hllenbyte[status] = src.ReadByte();
                        status = 3;
                        break;
                    case 3:
                        hllenbyte[status] = src.ReadByte(); 
                        int ret = (int)(((hllenbyte[0]) << 24) & 0xff000000);
                        ret |= (((hllenbyte[1]) << 16) & 0x00ff0000);
                        ret |= (((hllenbyte[2]) << 8) & 0x0000ff00);
                        ret |= (((hllenbyte[3])) & 0x000000ff);
                        len = ret;
                        if (len >= 0 && len < 8000000)
                        {
                            buf = new ByteBuf(len + 4); //帧的大小不算头部长度
                            buf.WriteInt(len);
                            status = 4;
                        }
                        else
                        {
                            status = 0;
                        }
                        break;
                    case 4:
                        int min = buf.WritableBytes();
                        min = src.ReadableBytes() < min ? src.ReadableBytes() : min;
                        if (min > 0)
                        {
                            buf.WriteBytes(src, min);
                        }
                        if (buf.WritableBytes() <= 0)
                        {
                            status = 0;
                            //重建包体，如果不成功则丢弃
                            var frame = Frame.ReBuildFrameFromBuf(buf);
                            if (frame != null)
                            {
                                return frame;
                            }
                            else
                            {
                                buf.StoreData();
                                Debug.LogError("丢弃错误的数据包");
                                frame = null;
                            }
                        }
                        break;
                }
            }
            return null;
        }

        /**
		 * 头部长度 
		 */

        public int HeaderLen()
        {
            return Frame.HeadLength;
        }

    }

    public class EnOrDecode
    { 
        public static byte[] keyTable=new byte[]
        {
  0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65,
  157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220,
  35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98,
  190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255,
  70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7,
  219, 133, 103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154,
  101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36,
  248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185,
  140, 210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113, 147, 205,
  17, 79, 173, 243, 112, 46, 204, 146, 211, 141, 111, 49, 178, 236, 14, 80,
  175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82, 176, 238,
  50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115,
  202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139,
  87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22,
  233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168,
  116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53
};
           
    }


}

